Imagination Gone Wild

I read somewhere that at three years old, children sometimes have trouble finding the line between imagination and reality. I'm not sure if this is true, but Caleb does seem to have a hard time knowing when to let his imagination roam and when to reign it in. I was not paying much attention to him at dinner last night until I heard little splashing noises coming from that side of the table. Caleb had piled pieces of chicken and carrot on his plate and poured water to one side of it creating a muddy pond. When I asked what in the world he was doing he looked at me like it should be completely obvious and answered, "The beaver is just building a dam."